108 lines
2.2 KiB
C
108 lines
2.2 KiB
C
/*
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* getopt - get option letter from argv
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*
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* This is a version of the public domain getopt() implementation by
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* Henry Spencer, changed for 4.3BSD compatibility (in addition to System V).
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* It allows rescanning of an option list by setting optind to 0 before
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* calling, which is why we use it even if the system has its own (in fact,
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* this one has a unique name so as not to conflict with the system's).
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* Thanks to Dennis Ferguson for the appropriate modifications.
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*
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* This file is in the Public Domain.
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*/
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/*LINTLIBRARY*/
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#include <stdio.h>
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#include "ntp_stdlib.h"
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#ifdef lint
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#undef putc
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#define putc fputc
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#endif /* lint */
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char *ntp_optarg; /* Global argument pointer. */
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int ntp_optind = 0; /* Global argv index. */
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int ntp_opterr = 1; /* for compatibility, should error be printed? */
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int ntp_optopt; /* for compatibility, option character checked */
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static char *scan = NULL; /* Private scan pointer. */
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static const char *prog = "amnesia";
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/*
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* Print message about a bad option.
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*/
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static int
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badopt(
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const char *mess,
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int ch
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)
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{
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if (ntp_opterr) {
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fputs(prog, stderr);
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fputs(mess, stderr);
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(void) putc(ch, stderr);
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(void) putc('\n', stderr);
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}
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return ('?');
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}
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int
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ntp_getopt(
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int argc,
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char *argv[],
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const char *optstring
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)
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{
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register char c;
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register const char *place;
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prog = argv[0];
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ntp_optarg = NULL;
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if (ntp_optind == 0) {
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scan = NULL;
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ntp_optind++;
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}
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if (scan == NULL || *scan == '\0') {
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if (ntp_optind >= argc
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|| argv[ntp_optind][0] != '-'
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|| argv[ntp_optind][1] == '\0') {
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return (EOF);
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}
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if (argv[ntp_optind][1] == '-'
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&& argv[ntp_optind][2] == '\0') {
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ntp_optind++;
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return (EOF);
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}
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scan = argv[ntp_optind++]+1;
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}
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c = *scan++;
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ntp_optopt = c & 0377;
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for (place = optstring; place != NULL && *place != '\0'; ++place)
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if (*place == c)
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break;
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if (place == NULL || *place == '\0' || c == ':' || c == '?') {
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return (badopt(": unknown option -", c));
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}
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place++;
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if (*place == ':') {
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if (*scan != '\0') {
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ntp_optarg = scan;
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scan = NULL;
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} else if (ntp_optind >= argc) {
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return (badopt(": option requires argument -", c));
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} else {
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ntp_optarg = argv[ntp_optind++];
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}
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}
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return (c & 0377);
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}
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